Reverses the array in place. - Java Collection Framework

Java examples for Collection Framework:Array Element

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Description

Reverses the array in place.

Demo Code

/*//from  w w  w.j  av  a  2 s. c  om
 * Copyright 2010-2010 LinkedIn, Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
//package com.java2s;

public class Main {
    /**
     * Reverses the array in place.
     * @param array the array to reverse
     * @return the <em>same</em> array provided NOT a new one!
     */
    public static <T> T[] reverse(T[] array) {
        if (array == null)
            return array;

        int s = 0;
        int e = array.length - 1;
        while (s < e) {
            // swap index e and s
            T tmp = array[e];
            array[e] = array[s];
            array[s] = tmp;

            s++;
            e--;
        }

        return array;
    }
}

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